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Parametric Study of Dumbbell-Shaped Specimens for Compression Testing of Ceramics Using Finite Element Analysis

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Technical Report,30 Mar 2020,18 Sep 2020

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CCDC Army Research Laboratory Aberdeen Proving Ground United States

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Compression strength testing of ceramics has historically been conducted using cylindrical- or cuboidal-shaped specimens due to simplistic analysis and reduced machining costs. However, these specimen geometries tend to exhibit large amounts of scatter and often fail from a nonuniform state of stress, rendering the strength results inconclusive. Instead, a dumbbell-shaped compression specimen has been proposed, simulated, and utilized for such strength tests to provide better estimates of material performance. This study reevaluates that specimen geometry via a modern finite element analysis simulation software. A parametric study is performed to investigate how modifications to the original specimen, its associated geometry, and simulation parameters could alter its performance during compression strength tests. High-rate testing with this specimen is also simulated using an explicit analysis code. It was determined that alterations to the specimen geometry most affected the performance, and it is suggested that a systematic study be carried out to identify further improvements to specimen geometry.

Subject Categories:

  • Ceramics, Refractories and Glass
  • Mechanics

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